(function($) {
  $.extend($.fn, {
    fileUpload: function(opts) {
      this.each(function() {
        var $self = $(this);
        var doms = {
          "fileToUpload": $self
        };
        var funs = {
          //选择文件，获取文件大小，也可以在这里获取文件格式，限制用户上传非要求格式的文件
          "fileSelected": function() {
            var files = (doms.fileToUpload)[0].files;
            console.dir((doms.fileToUpload)[0]);
            var count = files.length;
            for (var index = 0; index < count; index++) {
              var file = files[index];
              var fileSize = 0;
              if (file.size > 1024 * 1024)
                fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
              else
                fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
            }
            funs.uploadFile();
          },
          //异步上传文件
          uploadFile: function() {
            var fd = new FormData();//创建表单数据对象
            var files = (doms.fileToUpload)[0].files;
            var count = files.length;
            for (var index = 0; index < count; index++) {
              var file = files[index];
              fd.append(opts.file, file);//将文件添加到表单数据中
              //funs.previewImage(file);//上传前预览图片，也可以通过其他方法预览txt
            }
            var xhr = new XMLHttpRequest();
            xhr.upload.addEventListener("progress", funs.uploadProgress, false);//监听上传进度
            xhr.addEventListener("load", funs.uploadComplete, false);
            xhr.addEventListener("error", opts.uploadFailed, false);
            xhr.open("POST", opts.url);
            xhr.send(fd);
          },
          "uploadComplete": function(evt) {
          	console.dir(evt);
          	var result = JSON.parse(evt.target.responseText);
          	
          	console.log(result.sign);
            $.tips({
								content: '图片已上传',
								stayTime: 2000,
								type: "success"
							});
          }
        };
        doms.fileToUpload.on("change", function() {
        	console.dir(this);
          //doms.progress.find("span").width("0");
          funs.fileSelected();
        });
      });
    }
  });
})(Zepto);